Re: [Haskell-beginners] where do i get wrong

Hi, W dniu 02.03.2014 20:24, Roelof Wobben pisze:

Found this one:

This is partly working:

import Data.Char

x = "aBCde".isLower -- Note that comments are preceded by two hyphens {- or enclosed in curly brace/hypens pairs. -} main = print x

But now I see this error:

* Main.hs@3:5-3:12 Couldn't match expected type `b0 -> c0' with actual type `[Char]' In the first argument of `(.)', namely `"aBCde"' In the expression: "aBCde" . isLower In an equation for `x': x = "aBCde" . isLower * In an equation for `x': x = "aBCde" . isLower

Roelof

This expression is wrong: "aBCde".isLower You call (.) function with 2 arguments: "aBCde" and isLower. This doesn't make sense for the compiler (type checker). Regards, Emanuel